Twisted Hobbys YAK User manual

Rev: 2012.12.05.v004a 1
2000/2350kV
motor (
12g
-
14g
)
6 amp ESC
4 channel radio
2 3.5g / 1 4.0g servos
6 3 to 7 3.5 prop
2s 180 to 250mAh battery
USA Distributor
Twisted Hobbys
www.twistedhobbys.com
Wingspan = 24"
Length = 25"
AUW= 90 - 100g
yak
mxs
-
c
e
d
g
e

Rev: 2012.12.05.v004a 2
TABLE OF CONTENTS
TABLE OF CONTENTSTABLE OF CONTENTS
TABLE OF CONTENTS
Page
WARNING INFORMATION ....................................................................................................................................................... 3
SHIPPING DAMAGE.................................................................................................................................................................... 3
OUR MISSION............................................................................................................................................................................... 3
SAFETY NOTES............................................................................................................................................................................ 4
IMPORTANT: PRIOR TO ANY ASSEMBLY................................................................................................................... 4
KIT CONTENTS............................................................................................................................................................................ 5
OPTIONAL PARTS....................................................................................................................................................................... 6
TOOLS & ADHESIVES NEEDED .............................................................................................................................................. 7
THE BUILD.................................................................................................................................................................................... 8
CENTER OF GRAVITY ............................................................................................................................................................. 21
EXTREME & 3D SET UP PRECAUTIONS 21
CONTROL THROWS................................................................................................................................................................. 21
Extreme & 3D 21
Beginner & Sport 21
PRE-FLIGHT & TESTING ........................................................................................................................................................ 22
P REFLIGHT C HECKS 22
Motor 22
Flight Controls 22
Batteries 22
Radio 22
Range Check 22
F LIGHT T ESTING 22
S TORAGE 22
NOTES & S/U SHEET................................................................................................................................................................. 23
TIPS AND TRICKS ..................................................................................................................................................................... 24

Rev: 2012.12.05.v004a 3
TWISTED HOBBYS
Website: www.twistedhobbys.com – email: [e-mail]
Thank you for your purchasing a Twisted Hobbys’ model. Please read through the entire manual before beginning to
build this model. If you have any questions please contact us at the above indicated email address.
WARNING INFORMATION
WARNING INFORMATIONWARNING INFORMATION
WARNING INFORMATION
This R/C Aircraft is not a toy! Read and understand the entire manual before assembly. If misused, it can cause serious bodily harm and
property damage. Fly only in open areas, and AMA Academy of Model Aeronautics) approved flying sites. Do not over look the warnings
and instructions enclosed or those provided by other manufactures’ products. If you are not an experienced pilot and airplane modeler you
must use the help of an experienced pilot or an authorized flight instructor for the building and flying of this model aircraft.
These instructions are suggestions only on how to assemble this model. There are other ways and methods to do so. Twisted Hobbys has
no control over the final assembly, the materials and accessories used when assembling this kit, or the manner in which the assembled
model, installed radio gear and electronic parts are used and maintained. Thus, no liability is assumed or accepted for any damage
resulting from the use of the assembled model aircraft or from this instruction manual including but not limited to direct, indirect,
incidental, special, and consequential damages. By the act of using this user-assembled product, the user accepts all resulting liability. In
no event shall Twisted Hobbys’ liability exceed the original purchase price of the kit.
SHIPPING DAMAGE
SHIPPING DAMAGESHIPPING DAMAGE
SHIPPING DAMAGE
Twisted Hobbys checks each plane before shipping to ensure that each kit is in fine condition. We have no bearing on the condition of any
component parts damaged by use, modification, or assembly of the model. Inspect the components of this kit upon receipt. If you find any
parts damaged or missing, contact Twisted Hobbys immediately. We will not accept the return or replacement of parts on which assembly
work has already begun. Twisted Hobbys reserves the right to change this warranty at anytime without notice.
OUR MISSION
OUR MISSIONOUR MISSION
OUR MISSION
To provide the best products and service to our customers at the lowest prices possible. We take great pride in
our company, our commitment to customer service and in the products we sell. Our online store is designed
to provide you with a safe and secure environment to browse our product catalog.
Thank you for shopping with Twisted Hobbys!

Rev: 2012.12.05.v004a 4
SAFETY NOTES
SAFETY NOTESSAFETY NOTES
SAFETY NOTES
Before assembling and flying this model, read carefully any instructions and warnings of other
manufacturers for all the products you installed or used on your model, especially radio
equipment and power source.
Check thoroughly before every flight that the airplanes’ components are in good shape and
functioning properly. If you find a fault do not fly the model until you have corrected the
problem.
Radio interference caused by unknown sources can occur at any time without notice. In such a
case, your model will be uncontrollable and completely unpredictable. Make sure to perform a
range check before every flight. If you detect a control problem or interference during a flight,
immediately land the model to prevent a potential accident.
Youngsters should only be allowed to assemble and fly these models under the instruction and
supervision of an experienced adult.
Do not operate this model in a confined area.
Do not stand in line with, or in front of a spinning propeller and never touch it with any object.
IMPORTANT: PRIOR TO ANY ASSEMBLY
Please Note: after removing kit from shipping box, lay each piece flat on a
hard surface, this will allow the airframe to straighten out if lightly bent
from shipping. Do not worry since EPP is very pliable and can be bent back
if out of shape.

Rev: 2012.12.05.v004a 5
kit contents
kit contentskit contents
kit contents
standard parts list
2x - wing half
4x - side force generator
1x - fuselage 3 parts)
1x - canopy
1x - elevator
1x - rudder
2x - .5mm x 3mm x 500mm wing spar
2x - .8mm dia x 330mm control rod
2x - wheel pants
1x - tail skid
1x - hardware pack see detail)
hardware pack
2x - 1.0mm dia Aileron push rod*
2x - .5mm x 3mm x 145mm landing gear strut
2x - .5mm x 3mm x 99mm extra)
1x - plastic horn / accessory kit
6x - plastic snap links 2 are extra)
4x - quick link sets
1x - heat shrink tubing
* length may vary depending on the kit

Rev: 2012.12.05.v004a 6
Perfect choice for building and
repairing your Twisted Hobbys
EPP planes! This is the only
adhesive you will ever need.
Welder virtually bonds anything
to anything! Clear, heavy-duty,
flexible and water-proof when
dry. Use indoors or out. 1) 1 oz
tube
Note: many of these “optional parts” shown
or similar items, may be available from the
Twisted Hobbys’ web store.
OPTIONAL PARTS
OPTIONAL PARTSOPTIONAL PARTS
OPTIONAL PARTS
CA and Kicker
Various thickness CA glues
and
Activator available from
Twisted Hobbys’
Blenderm tape is one of the
best know tapes used for
hinging and repairing your
Depron or Epp models. Each
roll consists of 1/2" wide x 4m
in length
Specifications
6 Channel / DSM2 / 2.4GHZ
25mm X 19mm X 11mm
Weight: 3.0g / Input: 3.5–9.6V
Bind plug included
Power Combo Kit
(matched by Twisted Hobbys)
1x - 6a TH-CS ESC
2x - 3.5g servos
1x - 4.0g servo
1x - prop 7x3.5
Carbon bling especially designed
for the Crack Minis

Rev: 2012.12.05.v004a 7
Tools
Tools Tools
Tools &
&&
& A hesives Nee
A hesives Nee A hesives Nee
A hesives Nee e
ee
e
•ighter
•Small drill bits
•Tape Measure and Ruler
•Black Sewing Thread
•Welders Glue
•Hobby Knife w/new Blade
•Needle Nose Pliers
•Wire Cutters
•ow Temp Hot Glue Gun
•Course Sand Paper
•Scissors
•Small Phillips Screw Driver
•Thin & Medium CA
•CA Applicator Tips
•Activator
Tools shown and listed are suggestions only
.
D
epending
on your building technique you may not need everything
indicated – and/or – you may find that other tools
available to yourself may be of benefit to your Build.
It is also recommended that you have a flat building
surface, one that will accept stick pins and push pins.
An Acrostic Ceiling panel from your local hardware store
fits this bill nicely, and will lay flat on your work table.
Over size / long push pins are available at your local
craft store. These two items are by no means required,
but will aid in the building process, and can be used for
future projects.

Rev: 2012.12.05.v004a 8
THE BUILD
THE BUILDTHE BUILD
THE BUILD
CONSTRUCTION METHODS:
Building surface should be at least 2ft x 4ft and flat. Weights or some small heavy objects will be handy for holding things in place during
the time glue is setting.
Welders glue is the primary adhesive used for this build. The Rod Guides and End Links use thin CA with Applicator and Activator. When
using the Welders glue for a butt joint, apply a thin film to each surface, allow to sit for approx five minutes and then assemble.
Note that this method will create a nearly instant bond, so locate carefully when bringing the two pieces together. If alignment is
necessary or a slip joint, do not allow the glue to tack up, simple apply and join immediately, you will have several minutes to locate the
two parts before the glue sets up. In most cases the parts being glued can be handled with care in 30 minutes, full cure is approx 24
hours.
Open up you kit and inspect for damage and / or missing
parts. Use the Parts List on page 5 to verify that your kit is
complete.
Do the same with the Power Set, confirm that you have all
your items and that they appear to be in sound condition.
Testing of functionality will be one of the first steps that will
follow shortly.

Rev: 2012.12.05.v004a 9
Start the build by folding all the hinged
control surfaces back on themselves
and hold the position with some weight
Since the snap links need to dry over
night, build them now
Insert the end of the control rod that
the snap link will be glued to, about
3/8" into the nozzle of the Welders tube
and twist to get an even coat of glue
Remove from the tube and check that
you have an even medium coat of
Welders on the end of the control rod
Locate
the glued end of the rod onto the
saddle area of the plastic snap link. For
the Tail push rods, fully engage the rod
in the saddle area. For the aileron
control rods, see the next step....
... adjust the link onto the end of the
aileron control rod so that the over all
length from the center of the snap link boss
to the end of the rod is at minimum the
dimension above for your model

Rev: 2012.12.05.v004a 10
Hook up all the electronics, center and
test. Mount the control horns and
install the quick links as shown in the
outer most holes. Aileron horn is glued
on as shown in the next step
Glue the plastic ailerion differencial
horn on to the UNDER side of the
double sided stock horn as shown. this
is required to LG clearance). Let the
glue cure before adding the quick links
Tack up method will be used to attach
the canopy to the top half of the
fuselage. Lay a bead on the canopy,
bring the two parts together to
distribute the glue, than seperate.
Carefully bring the two parts together,
notice that the canopy material is a
little thinner, so center it on the mating
edge of the upper fuselage section
Photo showing how the canopy is to be
located in the center of the thickness of
the upper fuselage section
Use the tack up method to attach the
wings and elevator

Rev: 2012.12.05.v004a 11
On
ce the glue has tacked up, bring the
wing halves together, make sure the
tabs are all lined up
Prepare the two rectangle wing spars to
be installed. It is easier to temporarily
tack them together with CA before
installing into the slot in the wing
Lay the spars together with their edges
touching and place a small drop of CA
approx every 2 inches
Apply a mist of kicker...
... wipe away any extra CA and kicker...
allow the CA to setup for a couple
seconds before handling. This should
hold them together until installed into
the wing
Mini YAK : Free the tabbed areas of
the wing spar slot.
Mini MXS: Free the tabed areas AND
split the fuse as required for the spar.

Rev: 2012.12.05.v004a 12
Check that the slot is clear and test fit
the spar assembly
Apply a medium coat o
f Welders to both
sides fo the spar assembly
While spreading the foam, lay the spar
assembly into position
Once the spar is fully inserted, make
sure that there are no gaps between the
foam slot of the wing and the spar. Use
weights, tap and or stick pins to hold
everything tight. Let dry.
After the spar has been allowed to dry,
the top vert. fuselage section can be
installed. Attach this piece using the
WET glue method. Keep approx 1/4"
around the tail servo areas free of glue.
With a small square or other similar
item, verify that the vert. fuselage
section is perpendicular to the horiz.
assembly.

Rev: 2012.12.05.v004a 13
Once the upper fuselage has had a
chance to dry, flip the airframe over
and prepare to install the aileron
control horns
Clean up the precut slot to allow the
horn to be completely seated flush with
the bottom and ...
... so that the profile of the horn
matches the profile of the cut out
hinged area
Install the aileron servo into the large
slot. Note that the output arm will be
towards the nose and the horn
oreintat
ion should be as shown. Do not
use any glue on the servos at this time
Servo should sit flush on the mounting
ears. Feed the wire through on the side
shown. Make sure the servo is
electronically centered and that you
have installed the servo horn screw
Install the rudder servo from the top
side, insert as shown. Push the foam of
the vert. fuse slightly off to the side so
that the servo ears can slip underneath

Rev: 2012.12.05.v004a 14
View of the rudder servo full seated into
it's designated area. With the aircraft
upright, t
he output shaft is towards the
nose and the arm sticks out the left
side
Install the elevator servo as shown.
Again with the output shaft towards the
nose and servo are pointing up. Route
all the wires to one side as shown
Test fit t
hen glue the lower vert. fuse as
shown. Use the WET glue method for
this step. Make sure the fuse section
fits flush every where
Once all the tabs are fully engaged and
everything is flush, check for
squareness along the length of the
piece, once satisfied, allow to dry
Locate the motor mount and apply a
medium skim coat to the back of the
motor mount and the mating area of
the fuselage nose
Once the glue has tacked up, attach as
shown. Make sure and line up the tabs
of the motor mount with the foam
thickness edges

Rev: 2012.12.05.v004a 15
Attach the rudder using the tack up
method. Line up the slit in the rudder
with the mating top edge on the fuse,
there will be a step on the bottom this
is okay and intended
Locate the shorter of the two tail control
horns and
install into the precut slot. It
may be necessary to cut the slot a little
deeper. Make sure the horn in the
hinge area lines up with the foam
Longer horn is used on the rudder.
Install same as the elevator. See the
next picture for how the horns should
look when in the proper location
View showing how the profile of the
horn should match the profile of the
foam when installed in the proper
location
By now your snap links and control
rods should have had the chance to dry
for 24 hours. Locate the guides and
prepare to install
Slide the guides onto the rod, insert the
rod thru the quick link on the servo
and snap the snap link into the hole of
the control horn

Rev: 2012.12.05.v004a 16
Put a dab of Welders into each of the precut
holes, install the guides and align them all by
looking down the length of the rod. If using CA
install the guides first, align, then a drop of CA
at the base of each guide
Clip off the extra control rod length.
Leave about 1/2" extra in case you ever
need to redo the snap link end. .
Slightly tighten the screw, too much
will crush the rod
Install the aileron push rods. Make
sure the servo is electonically centered
and the the ailerons are level with the
horz. fuselage section. Slightly tighten
the screw, too much will crush the rod.
Over view showing how the horn should
be perpendicular to the fuselage with
the ends pointing forward as well as
both control surfaces being level with
the horz fuselage section
Land gear struts are next. Find the two
carbon rectangles and small plastic
bulkhead as pictured above
Squeeze a small amount of Welders into
the extreme upper and lower narrow
areas) of the LG slot, leave the wide
area free of glue at this time

Rev: 2012.12.05.v004a 17
Slide the LG struts through as shown.
There are small slits in the horz. fuse
section to recieve the ends.
Once satisfied, use the nozzle of the
Welders tube and squeeze some glue
into the horz. fuse slots and the vert.
fuse area. Wipe away any extra glue.
After the struts have had time to dry,
we will add the front gym floor) wheels
and rear skid. Welders or Medium CA,
if using Welders, let each step dry
completely before moving to the next
Glue the round doublers onto the
struts as shown. Leave about 1/8"
sticking out. Make sure that the are
both perpendicular to the wing and
parallel to each other
Once the doublers have dried attach
the wheel/wheel pant, centering the
doubler on the round part of the pant.
Make a small slit for the in the pant for
the extra cabon to go into
Attach them both. Again check that
they are square to the wing. Bottom
edge of the pant should roughly) be
parallel to the bottom of the wing

Rev: 2012.12.05.v004a 18
Using the tack up method, attach the
tail skid as shown. Front edge of the
skid should line up with the small
notch from where the rudder and fuse
meet up
Locate the SFG's and cut them free of
each other
Slit each of the SFG's as shown above,
there are small notches to help locate
the center of the tab. Note -
only cut the
small tab, leave the front of the SFG in
tact
Apply a thin bead of Welders to the area
where the SFG and Wing meet, as well
as some in the slot. Smaller SFG goes
outboard. Repeat for both wings. Make
sure they are square as the glue dries
OPTIONAL BLENDERM MOD
Use Blenderm to re-enforce the ends of all
the hinge lines. Also use some around the
tabs of the motor mount.... Skim coat of
Welders under the tape makes it stick
much better
Installation of the motor and esc are
next

Rev: 2012.12.05.v004a 19
Mount the motor with the included
screws. Make sure and route the wires
to the side you are going to install the
ESC on
Determine where you want to locate the
ESC and Receiver
Completed Electronics. Use a dab or
two of hot glue to hold the wires in
place
If you did not already set up a program
at the begining of the build, do so now
Set the CG to 2.375"
as measeared from
the leading edge closet to the fuselage.
Adjust battery location as required for
balance
Set the elevator and rudder throws up
to approx 50 degrees in each direction,
ailerons should be set to 40 degrees,
make sure there is not binding or
overload of the servos.

Rev: 2012.12.05.v004a 20
FINISHING TOUCHES
Tuck all the wires away and clean
up any glue strings that are left
over from the assembly process.
Double check that all the glue
joints are robust and secure.
Verify that servos are not stalling
at the extreme ends of travel.
Double check that all control
movements are in the proper
direction for command input
Congratulations, this completes the build. Don't let the size of these planes fool you,
they have higher wing loading than their big brothers, so they are very solid in the
air. Hang on when you bang the aileron stick, roll rates at full travel are insanely fast
with these airframes, make sure you have plenty of expo programmed in for the
initial flights. With the higher wing loading, these Minis don't mind a little breeze, but
if you have a basket ball court (or larger) indoor venue these models will really
shine. Adjust your program to suit and enjoy!
Another really good source of information for these and other Twisted Hobbys'
planes is RCGroups.